Effects of water deficit on growth and water use efficiency of summer maize under alternate partial root-zone irrigation
CHENG Minghui, FAN Junliang, ZHANG Fucang*, WANG Haidong, XIANG Youzhen
Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A & F University, Yangling, Shaanxi 712100, China
Abstract：In order to find the theoretical basis of water-saving irrigation for maize, effects of water deficit on growth, dry matter accumulation, grain yield, total water consumption and water use efficiency(WUE)of summer maize in various growth stages under alternate partial root-zone irrigation(APRI)were studied in a pot experiment. The results show that the plant height, leaf area and total water consumption under water deficit in seedling stage and the whole growth stage are significantly lower than those under conventional irrigation(CI)with sufficient irrigation, but WUE is increased by the water deficit occurred in the seedling stage. For the same irrigation method and deficit duration, the root dry weight, aboveground and total dry matter accumulation and grain yield in moderate water deficit are significantly higher than those in severe deficit. For the same irrigation method and irrigation level, the plant height, root dry weight, aboveground and total dry matter accumulation and total water consumption in seedling stage are significantly lower than those in milk stage, but the grain yield and WUE are substantially higher. For the same irrigation level and deficit period, the root dry weight and total water consumption under APRI are significantly lower than those under CI, but the grain yield and WUE under APRI are considerably higher than those under CI. This suggests that APRI with a moderate deficit in seedling stage is conducive to the regulation of vegetative growth to achieve the objective of water saving with high yield and WUE improvement.
程铭慧, 范军亮, 张富仓*, 王海东, 向友珍. 分根区交替灌溉下水分亏缺对夏玉米生长和水分利用效率的影响[J]. 排灌机械工程学报, 2018, 36(9): 819-823.
CHENG Minghui, FAN Junliang, ZHANG Fucang*, WANG Haidong, XIANG Youzhen. Effects of water deficit on growth and water use efficiency of summer maize under alternate partial root-zone irrigation. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(9): 819-823.
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